The moon, in consequence of its orbital revolution, having no connecting axial motion, has always presented but one side to the earth, so that in process of forming a crust, from its incipient molten state, it became, by the constant attraction of the earth upon one side, elongated toward our globe, now generally admitted to be by calculation about thirty miles, and proved by photographs, which also show an elongation. The necessary consequence of this constant attraction upon one side, has been not only to intensify volcanic action there, by the continued effect of gravitation, so long as its interior remained in a molten state, but from the same reasoning, to confine all such volcanic action exclusively to this side of the moon. Thus we have the reason for the violently disrupted state which that luminary presents to the telescopic observer, exceeding any analogy to be found upon our globe, as the earth's axial motion has prevented any similar concentrated action upon any particular part of its surface, either from solar or lunar attraction. Another marked effect of the elongation of the moon toward the earth has been to elevate its visible side high above its atmosphere (which would have enveloped it as a round body), and in consequence into an intensely cold region, producing congelation, in the form of frost and snow, which necessarily envelop its entire visible surface. These effects took place while yet the crust was thin and frequently disrupted by volcanic action, and wherever such action took place, the fiery matter ejected necessarily dissolved the contiguous masses of frost and snow, and these floods of water, as soon as they receded from the fiery element, were immediately converted into lengthened ridges of ice, diverging from the mountain summits like streams of lava. Hence many of the apparent lava streams are but ridges of ice, and in consequence, depending upon the angle of reflection (determined by the age of the moon, which is but its relative position between the sun and earth), all observers are struck with the brilliancy of the reflected light from many of those long lines of ridges. The general surface of the moon presents to the telescopic observer just that drear, cold, and chalk-like aspect, which our snow-clad mountains exhibit when the angle of reflection is similar to that in which we behold the lunar surface. In consequence, its mild light is due to the myriads of sparkling crystals, which diffusively reflect the rays of the sun.